Cohere

let model = CohereModel("command-a")

Key from COHERE_API_KEY; base URL https://api.cohere.com/v2.

Features

• Tools, structured output, and vision on the native v2 chat wire.
• Citations surface as StreamPart.source.
• No reasoning knob — the reasoning parameter is ignored.

Embeddings and reranking

Both are independent model protocols: CohereEmbeddingModel works with embed and embedMany, while CohereRerankingModel works with rerank.

let embeddings = try await embedMany(
  model: CohereEmbeddingModel("embed-v4.0"),
  values: documents
)

let ranked = try await rerank(
  model: CohereRerankingModel("rerank-v4-fast"),
  query: "How do I cancel my subscription?",
  documents: documents,
  topN: 3
)
ranked.rankedDocuments.first?.document       // best match
ranked.rankedDocuments.first?.relevanceScore

Models

As of July 2026: command-a (also served date-stamped as command-a-03-2025) for chat, embed-v4.0 for embeddings, and rerank-v4-pro / rerank-v4-fast (December 2025) or the older rerank-v3.5 for the reranker.